Talisman Teal vs Seafoam Blue

How close are they?

ΔE 19.0, loose: different enough that you should pick on purpose. Seafoam Blue is much more muted, cooler than Talisman Teal.

Can I use Seafoam Blue instead of Talisman Teal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Seafoam Blue is much more muted, cooler than Talisman Teal.

Can I use Talisman Teal instead of Seafoam Blue?

The same difference applies the other way round: Talisman Teal is much more saturated, warmer.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.